Electromagnetic structure of the proton, pion, and kaon by high-precision form factor measurements at large timelike momentum transfers

Kamal K. Seth*, Sean A Dobbs, Z. Metreveli, Amiran Tomaradze, T. Xiao, G. Bonvicini

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

The electromagnetic structure of the lightest hadrons, proton, pion, and kaon is studied by high-precision measurements of their form factors for the highest timelike momentum transfers of |Q2|=s=14.2 and 17.4 GeV2. Data taken with the CLEO-c detector at √s=3.772 and 4.170 GeV, with integrated luminosities of 805 and 586 pb-1, respectively, have been used to study e+e- annihilations into π+π -, K+K-, and pp̄. The dimensional counting rule prediction that at large Q2 the quantity Q2F(Q2) for pseudoscalar mesons is nearly constant, and should vary only weakly as the strong coupling constant αS(Q2) is confirmed for both pions and kaons. However, the measurements are in strong quantitative disagreement with the predictions of the existing quantum chromodynamics-based models. For protons, it is found that the timelike form factors continue to remain nearly twice as large as the corresponding spacelike form factors measured in electron elastic scattering, in significant violation of the expectation of their equality at large Q2. Further, in contrast to pions and kaons, a significant difference is observed between the values of the corresponding quantity |Q4|GM(|Q2|)/ μp for protons at |Q2|=14.2 and 17.4 GeV2. The results suggest the constancy of |Q2|GM(|Q2|)/μp, instead, at these large |Q2|.

Original languageEnglish (US)
Article number022002
JournalPhysical review letters
Volume110
Issue number2
DOIs
StatePublished - Jan 11 2013

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint

Dive into the research topics of 'Electromagnetic structure of the proton, pion, and kaon by high-precision form factor measurements at large timelike momentum transfers'. Together they form a unique fingerprint.

Cite this